气候变化领域集成服务门户(CCPortal): Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets

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DOI	10.5194/acp-22-8037-2022
	Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets
	You, Cheng; Tjernstrom, Michael; Devasthale, Abhay
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	8037
结束页码	8057
卷号	22 期号:12 页码:21
英文摘要	In this study, warm and moist air intrusions (WaMAIs) over the Arctic Ocean sectors of Barents Sea, Kara Sea, Laptev Sea, East Siberian Sea, Chukchi Sea, and Beaufort Sea in 40 recent winters (from 1979 to 2018) are identified from the ERAS reanalysis using both Eulerian and Lagrangian views. The analysis shows that WaMAIs, fueled by Arctic blocking, cause a relative surface warming and hence a sea-ice reduction by exerting positive anomalies of net thermal irradiances and turbulent fluxes on the surface. Over Arctic Ocean sectors with land-locked sea ice in winter, such as Laptev Sea, East Siberian Sea, Chukchi Sea, and Beaufort Sea, the total surface energy-budget is dominated by net thermal irradiance. From a Lagrangian perspective, total water path (TWP) increases linearly with the downstream distance from the sea-ice edge over the completely ice-covered sectors, inducing almost linearly increasing net thermal irradiance and total surface energy-budget. However, over the Barents Sea, with an open ocean to the south, total net surface energy-budget is dominated by the surface turbulent flux. With the energy in the warm-and-moist air continuously transported to the surface, net surface turbulent flux gradually decreases with distance, especially within the first 2 degrees north of the ice edge, inducing a decreasing but still positive total surface energy-budget. The boundary-layer energy-budget patterns over the Barents Sea can be categorized into three classes: radiation-dominated, turbulence-dominated, and turbulence-dominated with cold dome, comprising about 52 %, 40 %, and 8 % of all WaMAIs, respectively. Statistically, turbulence-dominated cases with or without cold dome occur along with 1 order of magnitude larger large-scale subsidence than the radiation-dominated cases. For the turbulence-dominated category, larger turbulent fluxes are exerted to the surface, probably because of stronger wind shear. In radiation-dominated WaMAIs, stratocumulus develops more strongly and triggers intensive cloud-top radiative cooling and related buoyant mixing that extends from cloud top to the surface, inducing a thicker well-mixed layer under the cloud. With the existence of cold dome, fewer liquid water clouds were formed, and less or even negative turbulent fluxes could reach the surface.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000813838800001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273526
作者单位	Stockholm University; Swedish Meteorological & Hydrological Institute
推荐引用方式 GB/T 7714	You, Cheng,Tjernstrom, Michael,Devasthale, Abhay. Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets[J],2022,22(12):21.
APA	You, Cheng,Tjernstrom, Michael,&Devasthale, Abhay.(2022).Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(12),21.
MLA	You, Cheng,et al."Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.12(2022):21.